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MTP -493G/T gene polymorphism is associated with steatosis in hepatitis C-infected patients

Erika Rabelo Forte de Siqueira,C. Oliveira,M. Côrrea-Giannella,J. T. Stefano,A. M. Cavaleiro,M. Fortes,Maria Tereza Cartaxo Muniz,F. S. Silva,Leila Maria Moreira Beltrão Pereira,F. J. Carrilho

Published 2011 in Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas

ABSTRACT

The reduction of hepatic microsomal transfer protein (MTP) activity results in fatty liver, worsening hepatic steatosis and fibrosis in chronic hepatitis C (CHC). The G allele of the MTP gene promoter, -493G/T, has been associated with lower transcriptional activity than the T allele. We investigated this association with metabolic and histological variables in patients with CHC. A total of 174 untreated patients with CHC were genotyped for MTP -493G/T by direct sequencing using PCR. All patients were negative for markers of Wilson's disease, hemochromatosis and autoimmune diseases and had current and past daily alcohol intake lower than 100 g/week. The sample distribution was in Hardy-Weinberg equilibrium. Among subjects with genotype 1, 56.8% of the patients with fibrosis grade 3+4 presented at least one G allele versus 34.3% of the patients with fibrosis grade 1+2 (OR = 1.8; 95%CI = 1.3-2.3). Logistic regression analysis with steatosis as the dependent variable identified genotypes GG+GT as independent protective factors against steatosis (OR = 0.4, 95%CI = 0.2-0.8; P = 0.01). The results suggest that the presence of the G allele of MTP -493G/T associated with lower hepatic MTP expression protects against steatosis in our CHC patients.

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